Products > Test Equipment
Rigol DS1000Z series buglist continued (latest: 00.04.04.04.03, 2019-05-30)
ebastler:
--- Quote from: 2N3055 on March 06, 2018, 08:06:21 pm ---Put it in vector mode and it looks exactly as it should....
--- End quote ---
--- Quote from: ebastler on March 06, 2018, 07:32:21 pm ---Well, it's most obvious in dot mode -- but the line mode suffers from an inflated noise (trace width) if it plots only the outliers and connects them with lines.
Averaging is fine if you want to look at a stationary signal, but pretty useless when looking for fluctuations or spurious events. So you will have to live with the inflated noise when you are after that. (And at the same time have to measure at the slower time bases, to be fair.)
I'm still happy with my DS1054Z; but it would be a pity if Rigol make the noise performance look worse than it is, just by careless digital processing.
--- End quote ---
2N3055:
--- Quote from: ebastler on March 06, 2018, 08:10:24 pm ---
--- Quote from: 2N3055 on March 06, 2018, 07:59:25 pm ---I am specifically commenting Reply #254.....
--- End quote ---
Me too, and specifically on the first two screenshots in that post. ;)
As to the third image in #254, I agree that it is not a meaningful measurement setting. But it can serve as another test case for the assumed "unwanted peak detection": I would indeed expect to see the occasional dot inbetween those two extreme lines. (While the sine signal spends most of its time near the extrema, the transition time between them is certainly not negligible, and hence the probability to "catch" a sample inbetween should not be negligible either.)
--- End quote ---
@ebastler, I apologize, I meant specifically to that last third image...
In non peak detect mode at slow timebase and dot mode, with decimation, signal would get very VERY few dots vertically in between... At that sampling ratio, it does spend negligible time going up and down...
That is why you have to use vector interpolation....
Regards,
Sinisa
Porcine Porcupine:
--- Quote from: Fungus on March 06, 2018, 08:08:35 pm ---Nah, they all do it (I think).
It's not noise, it's a high frequency sine wave. See my post in the other thread, the signal is very clear at maximum zoom:
https://www.eevblog.com/forum/testgear/help-my-new-rigol-ds1054z-shows-a-weird-double-trace/msg1363145/#msg1363145
--- End quote ---
Ah, I think I see now why you were saying it's aliasing and I had a hard time understanding how it could be aliasing. I was assuming the noise is a spectrum of high frequencies, and I think you had that single-frequency sine wave in mind.
The time segment you zoomed into isn't indicative of the noise over a full cycle of the square wave on my oscilloscope. When I zoom all the way into the trace on my oscilloscope, I can find time segments that look like a single sine wave as in your example. But I can move around and find other segments that look very different and obviously have other frequency components. This is why I didn't think it was aliasing.
konnor:
I publish my attempt to correct some errors on DS1000Z firmware (2017).
The archive in this message contains the modified firmware.
In the next post is attached an archive with a library and tools for
make&load plugins. Two simple examples are included.
changes on firmware:
1) Ext port 6000 funcs - read/write/call (see rigolif programm)
2) pluses -> pulses
3) rnage -> range (decoder:conf:range)
4) Changed USB Buffer Size (40->200) - test, please. I don't use USB IF
5) Disabled set bandwidth to license maximum on start (BW20 fix)
directory in plugin archive:
rigolif sample programm for 6000/UDP
add_info mixed info
libb plugin library
patch port 6000/UDP patch sources
plugin_simple sample of simple plugin (single LED cycle and exit)
plugin_thread plugin with thread (permanent LED cycle)
!!!WARNING!!!
This is Beta version. Tested only in my Rigol
AS IS, AS IS, AS IS.....
Update: Archive with color-bug firmware removed, see update in new topic: https://www.eevblog.com/forum/testgear/rigol-ds1000z-firmware-patch-plugins/
ebastler:
--- Quote from: konnor on March 30, 2018, 07:33:32 pm ---I publish my attempt to correct some errors on DS1000Z firmware (2017).
--- End quote ---
Wow, that is quite amazing! But I am reluctant to try it...
What version number did you give the new firmware? If I want to go back to a standard firmware, can I do that? (To which version?) I seem to recall that Rigol does not allow "downgrades" of the verion number, so can one ever go back?
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